Rickets, if untreated, mainly involves changes in skeletal deformities and motor function in children. Rickets is primarily caused by a deficiency in vitamin D, which is essential for promoting the absorption of calcium. A deficiency in vitamin D leads to reduced calcium absorption. Lower calcium absorption results in a calcium deficiency in the body, which in turn causes changes in the bones. In the early stages of vitamin D deficiency, the main symptoms are increased neural excitability, which may manifest as startle reactions, irritability, restlessness, and excessive sweating. During the active phase, symptoms of increased nervous system excitability become more pronounced, mainly presenting as skeletal deformities. What aspects do these skeletal deformities affect? One is the softening of the skull, pigeon chest, funnel chest, and changes resembling wristbands and anklets. If the condition worsens further, it can present as X-shaped legs, O-shaped legs, and spinal deformities. Thus, if rickets progresses, it can lead to skeletal deformities and impairments in motor functions, among other issues.